Auxiliary wheel for vehicles



Aug. 9, 1949. F. F. CALLAN AUXILIARY WHEEL- FOR VEHICLES 2 Sheets-Sheet 1 Filed Nov. 10, 1947 zm 2.5m

-]NVENTOR. Q

. Frank R Callam.

BY M22. aw

Afforlzey Aug. 9, 1949. F. F. CALLAN AUXILIARY WHEEL FOR VEHICLES 2 Sheets-Sheet 2 Filed NOV. 10, 1947 INVENTOR. F'ranl: R Callaw'.

' Affor/ eq Patented Aug. 9, 1949 auaesa.

"WHEEL VEHI'GDES imam; an, enem Tenn. App!ioa-tion-'Novcmber 10, 1947; Serial No. 785.;03'7

1 present invention relates generally to auxiliary wheels iorr-motorvehiclesiand more pair-'- tieularly toamauxiliary wheel adapted-.to-tbe'lowered into ground engaging position tosnpporhthe vehicle: in the eventthat oneaoi the main: vehicle wheels becomes; inoaspaeitated.v

Amohjeototthe:inventionsis to-provide a novel system;ofiselectively'eonttolledauxiliary daemoneratedmunning wheelsion each .main wheeh a vehicle using 'pneumaticrtires; whereby when the tireonany of the. main vehicle wheels heoomes deflated the auxiliary wheekforrthei incapacitated main wheel may be lowemrluintoz-gmund. en aging position to support the vehioieLWhile it is driventeaservicestationsongarageiomepain Another. object. is to provide eombi-nation with an auxiliary ehiele wheelzmountedafiaeent a main well-ink: wheels; a iaektforraiternateh' reds.- ing. andloweringrthe saidwheels wit-h respect to each: other, safiuiack heingaoneratively with the brake onv themaim reanyehhile wheel, whereby when the-"jackilowers theazuxiliarr'wheel of-one of the rear ,mainwheels to ground: engaging position. to; elevate the: wheel :from the groundrthe; brake of tlzie elevated: main wheeleis automatically applied: to pneventzrotatioh thereof while power supplied by the other: rear wheel to drive; the vehieletoa repairstation;

A further object is: taproy-ideina --vehiolerzhaving. auxiliary opera-timely assooiatedr running wheels ior. each main. wheel, a dashboardzoontrol system forselecttvelyalternetelszznaisingandlowering one of the main wheelslaof a uehiele with respecttoitsoperativelyassociatedauxiliaryrunhing wheel.

still a further objeetisteproviclte anwel arr-.- rangement for. pi-yotallx-metmting: auxiliaryehieleattaehed wheelson thebrakesheesupmns of the mainwehicle:wheelswherehytheauxhiary wheels are effectively aaldefliciently madera necessary art of. the permanenteqmwmnt of. the vehicle;

The above. andotl'rer :objee mnd -alivantages of the. present. invention; will; appear" more: hereinafter from-aconsideration; of; the sietailed description which follows, taken together with-the accompa yineurawingswhereinnneemodiment of the invention is illustrated; HxiSftfiM expressly understood, however;.sthat the drawin s are; for-the at illustratiienwon'al'r and: are

notidesignedsxasa definition ofthelimitsot the intention;

In, the:adrawhigs wheneimlikerefenenoe oharam ters refer" to: like:-

ti iroughoua several views:-

seams (erase-e150) Figure I; is a; side elevationr of an automobile generally showing the auxiliary wheelsmisethamd the various position's -of-the selective controls: and hydraulic pumpsyst'em tor-raising and lowering the auxiliary wheels as needed.

Figure 2- isa detail of one of. the" main wheels-with associated auxiliary wheel shown in solid lines to (16110178lfllEfiQWH-OFTOWQEQd'flOSfi ;tion of the auxiliarywheel and 'indott'ed times to denote the up or raised position: thereof with the hydraulic actuating eonnections.

Figure 3 isan elevational detail view of one: of the front wheels with its associated" wheel shown in soli'd lines to-denote the down or lowered position of the auxiliary wheel andlin dotted lines to denote the up or raised position thereof with the hydraulic actuating. oormections Figure 4 1s airont view-0f part of thezuehicle dashboard. showing the selective control valve levers for-the front" and reartires mane wheels.

Figure 5 is an isometric view- 0f the rearsauxii iary wheel mounting torkand it's brakeiopemting l connection.

Referring in detail to the drawing first with reference to: Figure *11, .thererisfill-ustratedi anamfmobil'e A. This-automobile includes the-usual .four main wheelsa'havin two frontims. M: and two rear tires II. 'Mounted on theibrahehous- .ings of each of the front and'rearmain-wheels'zare rubber covered-1 or tiredauxiliary: wheels M and t6, respectively;

These-auxiliary wheels are movable touandrfrzom ground engaging position by suitable power means. such as :hy seiwoacylinders 183817 the: front or servo cylinders [9 at thereazr; 'The frontaufl iary wheels M are preferably mountedidiffemtlw from the rear auxiliary wheels l6 for the reason that the rear auxiliary wheels are arranged to apply the. main'whee-l brakes ,2'I when-lowered to ground engaging position. Eachtbliakehoufiilig is of: the; usual conventional oonstruotiomxtor example the afrontbrakehousinglshownfin comprises a brake :shoermountingvplateifkeyecktp the axle 24;.whilethe-brakednumtlfii' oarriedrto r rotatewithx-the main vehiole wheelx l'lla the iront'auxiliary' wheelsul 4 "are;- brake .shoez mounting: plate :23- means: of annular ring; a

The front auxiliary wheel mounting ringfiaB-igis mounted on the circumferential peripheral edge 30 of theibrake-shoeplatezfl byaovefilappingzlugs 32', sothat the inner :bone 10f thetininginterfitsi-iho tween the opposite peri'pheratliiaoe of tha plate-:23

and- -the' rim of the' brake: dnurm if. 18 oanhe rotated oyer the:

pump 58.

of the brake shoe plate 23 by the servo-cylinder l8 as hereinafter explained. Formed from the outer peripheral edge of the ring 28 are apertured ears 34 and 35. The car 34 carries a stub axle 38 on which is journalled the auxiliary wheel l4 and the ear 35 carries a pin 39 on which is journalled the bearing 46 of a piston rod 4| connected to a piston 42 extending into the servo-cylinder l8. This cylinder is formed with an apertured lug 45 to thereby pivotally connect with an apertured car 36 by a pin 41, which ear 36 is formed from the edge of the fixed brake shoe plate 23.

The cylinder l8 for the sake of demonstration is connected at each end with fluid feed conduits 50 and 5| leading from a master control cylinder 53 and valve 54. The master cylinder is in turn connected by pressure supply and return conduits {55 and 56 to the reservoir 51 of a hydraulic pump 58. motor 66, which is connected from the vehicles battery, not shown, through leads 6| and 62 to a switch control 64 mounted inside the vehicle, see Figure 1. Each of the front auxiliary-wheels I4 are selectively controlled by levers 64 and 65, as illustrated with lever 64, in Figure 3, to thereby control the supply of fluid to the conduits 50 and 5| and the servo-cylinder or jack cylinder l8 from the master cylinder 53.

Each of the front auxiliary wheel mountings and fluid actuating means are identical; but the rear auxiliary wheel mountings are different, and

also. the specific mounting of the servo-cylinders IQ of each rear wheel; However, as the pump mechanism and feed lines to the rear servo-cylinders l9 are identical, they are given the same reference numerals throughout with the exception of the supply conduits 65 and 66 connecting from the master cylinder 53 to the servo-cylinder Ii).

Each rear auxiliary wheel I 6 is mounted to revolve in a forked lever 1|) keyed on a shaft H pivotally mounted in a brake shoe mounting plate '|3, see Figures 2 and 5. The shaft H is formed with a cam 15 for expanding or spreading the brake shoes 2| when the auxiliary wheel I6 is lowered to ground engaging position by the servocylinder l9, supported by the apertured ear H5 on mounting plate 13 by a pin 61 carried by the said cylinder.

The wheel fork lever 16 is formed with an intermediate enlarged section 11 having a flat surface with an elongated opening 18 therethrough. Across the opening is a pin 86 on which is pivotally connected the end of a piston rod 8|, the upper end of which carries a piston 83' movable inside of the servo-cylinder l9 by fluid pressure from lines or conduits 65 and 66.

Operation In all general respects the hydraulic or fluid actuating means is the same in structure and operation for both the front and rear auxiliary wheels. The chief difference is that the rear auxiliary wheels are arranged on the levers 16 which apply the main brakes 2| when the auxiliary wheels are lowered. Accordingly, a description of the operation of one of the rear auxiliary wheels only is considered sufficient for a complete understanding of both the front and back wheel operation.

For example, assume one of the rear tires H is flat. All that is necessary to raise the tire [from the ground i to close the electric circuit 6|62 to the motor by switch 64 to operate the Next a selective control lever 82 or '83 on the dashboard is pulled out from the dotted This pump may be driven by an electric position shown in Figure 2, and the fluid supplied by the pump flows through conduit 65 from master cylinder 53 to the top end of servo-cylinder IS. The fluid enters the cylinder I9 back of the piston 83', whereby the rod 8| moves to lower the auxiliary wheel |6 to the ground and raises the flat main tire I I from the ground.

Simultaneously with the lowering of the auxiliary wheel, the lever 10 turns shaft 1| and its operatively associated cam I5 expands the brake shoes 2| to lock the main wheel against rotation. This will permit the remaining good rear tire to still serve as a traction or drive means for the vehicle, so that it can be driven under its own power on the auxiliary wheel l6 and its remaining three good wheels to a repair station. Without this simultaneous brake action the rear elevated wheel would spin and cause considerable vibration and noise, uch as to make driving impractical.

' The. front wheels are operated similarly by the fluid control system, which turns the auxiliary wheel carrier ring 28 to raise and lower the front wheels.

Although only one embodiment of the invention has been illustrated and described in detail, it is to be expressly understood that the same i not limited thereto. Various changes may be made in the design and arrangement of the parts illustrated, as will nowbe apparent to those skilled in the art. For a definition of the invention, reference should be had primarily to the appended claims.

What I claim is:

1. An auxiliary wheel system for power driven vehicles comprising an auxiliary wheel mounted adjacent each main vehicle rear wheel, a brake shoe support plate for each main rear wheel, an auxiliary wheel mounting means pivotally supported on each brake shoe plate, said mounting means including a brake operating member adapted to apply a main vehicle wheel brake when the auxiliary wheel'adjacent thereto is lowered to the ground, and automatic power means for selectively lowering the auxiliary wheels to the ground andsimultaneously actuating said brake operating member to apply the said brake.

2. An auxiliary wheel system IfO I a vehicle comprising an auxiliary wheel mounted adjacent each one of the vehicles front and rear main wheels,

said auxiliary wheels being pivoted to the brake shoe support plates of each main wheel, each of said auxiliary wheels adjacent the rear main wheels being rotatably mounted on a forked lever, said lever being pivoted on a pin turnably mounted between the brake shoes of the rear main wheel, a cam on said pin, and a fluid operated piston rod connected to the said lever adapted to lower one or the other of said auxiliary wheels to the ground to raise its adjacent main rear wheel from the ground and thereby'simultaneously turn the cam to apply the brakes of the raised rear wheel, whereby the remaining rear wheel may be used to provide traction and drive the vehicle under its own power to a repair station.

3. An auxiliary wheel system for a vehicle comprising an auxiliary wheel mounted adjacent each one of the vehicles front and rear main wheels, said auxiliary wheels being pivoted to the brake shoe support plates of each main wheel, each of said auxiliary wheels adjacent the front main wheels being turnably supported on mounting means mounted on the peripheraledge of the said brake shoe support plate, said mounting means comprising a ring formed with lugs adapted to overlap the edge of the said support plate, an apertured ear formed from said ring in which said auxiliary wheel is journalled, a second apertured ear formed from the ring circumferentially spaced from said first car, a piston rod connected to said second ear, a third apertured ear formed from the brake support plate and circumferentially spaced from the said second ear for mounting a servo-cylinder irom which said piston rod extends, and hydraulic operating means for reciprocating the said piston rod from the cylinder, to thereby turn said ring and said auxiliary wheel to ground engaging position so as to raise an incapacitated adjacent main wheel from the ground on the auxiliary wheel until repaired.

FRANK F. CALLAN.

REFERENCES CITED The following references are of record in the file of this patent:

5 UNITED STATES PATENTS Number Name Date 1,743,005 Resler Jan. 7, 1930 1,860,217 Azopardi May 24, 1932 2,126,083 Bailey Aug. 8, 1938 2,167,929 Johnson Aug. 1, 1939 2,460,178 Kember Jan. 25, 1949 FOREIGN PATENTS Number Country Date 15 181,139 Switzerland Feb. 17, 1936 

